runtime/StringConstructor.cpp

   1 /*
   2  *  Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
   3  *  Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
   4  *
   5  *  This library is free software; you can redistribute it and/or
   6  *  modify it under the terms of the GNU Lesser General Public
   7  *  License as published by the Free Software Foundation; either
   8  *  version 2 of the License, or (at your option) any later version.
   9  *
  10  *  This library is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  *  Lesser General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU Lesser General Public
  16  *  License along with this library; if not, write to the Free Software
  17  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  18  *
  19  */
  20
  21 #include "config.h"
  22 #include "StringConstructor.h"
  23
  24 #include "Executable.h"
  25 #include "JITCode.h"
  26 #include "JSFunction.h"
  27 #include "JSGlobalObject.h"
  28 #include "StringPrototype.h"
  29
  30 namespace JSC {
  31
  32 static EncodedJSValue JSC_HOST_CALL stringFromCharCode(ExecState*);
  33
  34 }
  35
  36 #include "StringConstructor.lut.h"
  37
  38 namespace JSC {
  39
  40 const ClassInfo StringConstructor::s_info = { "Function", &InternalFunction::s_info, 0, ExecState::stringConstructorTable };
  41
  42 /* Source for StringConstructor.lut.h
  43 @begin stringConstructorTable
  44   fromCharCode          stringFromCharCode         DontEnum|Function 1
  45 @end
  46 */
  47
  48 ASSERT_CLASS_FITS_IN_CELL(StringConstructor);
  49
  50 StringConstructor::StringConstructor(ExecState* exec, JSGlobalObject* globalObject, Structure* structure, StringPrototype* stringPrototype)
  51     : InternalFunction(&exec->globalData(), globalObject, structure, Identifier(exec, stringPrototype->classInfo()->className))
  52 {
  53     putDirectWithoutTransition(exec->globalData(), exec->propertyNames().prototype, stringPrototype, ReadOnly | DontEnum | DontDelete);
  54     putDirectWithoutTransition(exec->globalData(), exec->propertyNames().length, jsNumber(1), ReadOnly | DontEnum | DontDelete);
  55 }
  56
  57 bool StringConstructor::getOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot &slot)
  58 {
  59     return getStaticFunctionSlot<InternalFunction>(exec, ExecState::stringConstructorTable(exec), this, propertyName, slot);
  60 }
  61
  62 bool StringConstructor::getOwnPropertyDescriptor(ExecState* exec, const Identifier& propertyName, PropertyDescriptor& descriptor)
  63 {
  64     return getStaticFunctionDescriptor<InternalFunction>(exec, ExecState::stringConstructorTable(exec), this, propertyName, descriptor);
  65 }
  66
  67 // ------------------------------ Functions --------------------------------
  68
  69 static NEVER_INLINE JSValue stringFromCharCodeSlowCase(ExecState* exec)
  70 {
  71     unsigned length = exec->argumentCount();
  72     UChar* buf;
  73     PassRefPtr<StringImpl> impl = StringImpl::createUninitialized(length, buf);
  74     for (unsigned i = 0; i < length; ++i)
  75         buf[i] = static_cast<UChar>(exec->argument(i).toUInt32(exec));
  76     return jsString(exec, impl);
  77 }
  78
  79 static EncodedJSValue JSC_HOST_CALL stringFromCharCode(ExecState* exec)
  80 {
  81     if (LIKELY(exec->argumentCount() == 1))
  82         return JSValue::encode(jsSingleCharacterString(exec, exec->argument(0).toUInt32(exec)));
  83     return JSValue::encode(stringFromCharCodeSlowCase(exec));
  84 }
  85
  86 static EncodedJSValue JSC_HOST_CALL constructWithStringConstructor(ExecState* exec)
  87 {
  88     JSGlobalObject* globalObject = asInternalFunction(exec->callee())->globalObject();
  89     if (!exec->argumentCount())
  90         return JSValue::encode(new (exec) StringObject(exec, globalObject->stringObjectStructure()));
  91     return JSValue::encode(new (exec) StringObject(exec, globalObject->stringObjectStructure(), exec->argument(0).toString(exec)));
  92 }
  93
  94 ConstructType StringConstructor::getConstructData(ConstructData& constructData)
  95 {
  96     constructData.native.function = constructWithStringConstructor;
  97     return ConstructTypeHost;
  98 }
  99
 100 static EncodedJSValue JSC_HOST_CALL callStringConstructor(ExecState* exec)
 101 {
 102     if (!exec->argumentCount())
 103         return JSValue::encode(jsEmptyString(exec));
 104     return JSValue::encode(jsString(exec, exec->argument(0).toString(exec)));
 105 }
 106
 107 CallType StringConstructor::getCallData(CallData& callData)
 108 {
 109     callData.native.function = callStringConstructor;
 110     return CallTypeHost;
 111 }
 112
 113 } // namespace JSC